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Gamma‐irradiation to inactivate thioglucosidase of crucifers
Author(s) -
Lessman K. J.,
McCaslin B. D.
Publication year - 1987
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02542009
Subject(s) - crambe , sinapis , white mustard , myrosinase , erucic acid , brassica , glucosinolate , food science , chemistry , crucifer , enzymatic hydrolysis , hydrolysis , brassicaceae , biology , botany , biochemistry
Abstract The crucifers contain glucosinolates which through enzymatic hydrolysis give rise to toxicants that limit the use of oil‐free meal obtainable from this plant family. Seeds from three crucifers were used to test gamma irradiation to inactivate enzyme systems as a step toward detoxification. Seeds of Crambe abyssinica Hochst (crambe), ground seeds of Sinapis alba L. (mustard), and seeds of Brassica napus L. (rape) were subjected to gamma‐irradiation (6.25, 12.5, 25.0 and 50.4 Mrad) to inactivate thioglucosidase and/or destroy glucosinolates. Samples of ground seeds, their oil‐free meals, previously irradiated ground seeds and their oil‐free meals were assayed for glucose, a product of enzymatic hydrolysis of glucosinolates present in the crucifer seeds. The 50.4 Mrad exposure inactivated thioglucosidase but did not destroy glucosinolates. The fatty acid contents of extracted oils were affected. The amino acid profile of defatted crambe protein meal was affected, while that of white mustard was not.